1 /*****************************************************************************/ 2 3 /* 4 * devio.c -- User space communication with USB devices. 5 * 6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * This file implements the usbfs/x/y files, where 23 * x is the bus number and y the device number. 24 * 25 * It allows user space programs/"drivers" to communicate directly 26 * with USB devices without intervening kernel driver. 27 * 28 * Revision history 29 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 30 * 04.01.2000 0.2 Turned into its own filesystem 31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 32 * (CAN-2005-3055) 33 */ 34 35 /*****************************************************************************/ 36 37 #include <linux/fs.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 #include <linux/smp_lock.h> 41 #include <linux/signal.h> 42 #include <linux/poll.h> 43 #include <linux/module.h> 44 #include <linux/usb.h> 45 #include <linux/usbdevice_fs.h> 46 #include <linux/cdev.h> 47 #include <linux/notifier.h> 48 #include <linux/security.h> 49 #include <asm/uaccess.h> 50 #include <asm/byteorder.h> 51 #include <linux/moduleparam.h> 52 53 #include "hcd.h" /* for usbcore internals */ 54 #include "usb.h" 55 #include "hub.h" 56 57 #define USB_MAXBUS 64 58 #define USB_DEVICE_MAX USB_MAXBUS * 128 59 60 /* Mutual exclusion for removal, open, and release */ 61 DEFINE_MUTEX(usbfs_mutex); 62 63 struct dev_state { 64 struct list_head list; /* state list */ 65 struct usb_device *dev; 66 struct file *file; 67 spinlock_t lock; /* protects the async urb lists */ 68 struct list_head async_pending; 69 struct list_head async_completed; 70 wait_queue_head_t wait; /* wake up if a request completed */ 71 unsigned int discsignr; 72 struct pid *disc_pid; 73 uid_t disc_uid, disc_euid; 74 void __user *disccontext; 75 unsigned long ifclaimed; 76 u32 secid; 77 u32 disabled_bulk_eps; 78 }; 79 80 struct async { 81 struct list_head asynclist; 82 struct dev_state *ps; 83 struct pid *pid; 84 uid_t uid, euid; 85 unsigned int signr; 86 unsigned int ifnum; 87 void __user *userbuffer; 88 void __user *userurb; 89 struct urb *urb; 90 int status; 91 u32 secid; 92 u8 bulk_addr; 93 u8 bulk_status; 94 }; 95 96 static int usbfs_snoop; 97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 99 100 #define snoop(dev, format, arg...) \ 101 do { \ 102 if (usbfs_snoop) \ 103 dev_info(dev , format , ## arg); \ 104 } while (0) 105 106 enum snoop_when { 107 SUBMIT, COMPLETE 108 }; 109 110 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 111 112 #define MAX_USBFS_BUFFER_SIZE 16384 113 114 115 static int connected(struct dev_state *ps) 116 { 117 return (!list_empty(&ps->list) && 118 ps->dev->state != USB_STATE_NOTATTACHED); 119 } 120 121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 122 { 123 loff_t ret; 124 125 lock_kernel(); 126 127 switch (orig) { 128 case 0: 129 file->f_pos = offset; 130 ret = file->f_pos; 131 break; 132 case 1: 133 file->f_pos += offset; 134 ret = file->f_pos; 135 break; 136 case 2: 137 default: 138 ret = -EINVAL; 139 } 140 141 unlock_kernel(); 142 return ret; 143 } 144 145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 146 loff_t *ppos) 147 { 148 struct dev_state *ps = file->private_data; 149 struct usb_device *dev = ps->dev; 150 ssize_t ret = 0; 151 unsigned len; 152 loff_t pos; 153 int i; 154 155 pos = *ppos; 156 usb_lock_device(dev); 157 if (!connected(ps)) { 158 ret = -ENODEV; 159 goto err; 160 } else if (pos < 0) { 161 ret = -EINVAL; 162 goto err; 163 } 164 165 if (pos < sizeof(struct usb_device_descriptor)) { 166 /* 18 bytes - fits on the stack */ 167 struct usb_device_descriptor temp_desc; 168 169 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 170 le16_to_cpus(&temp_desc.bcdUSB); 171 le16_to_cpus(&temp_desc.idVendor); 172 le16_to_cpus(&temp_desc.idProduct); 173 le16_to_cpus(&temp_desc.bcdDevice); 174 175 len = sizeof(struct usb_device_descriptor) - pos; 176 if (len > nbytes) 177 len = nbytes; 178 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 179 ret = -EFAULT; 180 goto err; 181 } 182 183 *ppos += len; 184 buf += len; 185 nbytes -= len; 186 ret += len; 187 } 188 189 pos = sizeof(struct usb_device_descriptor); 190 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 191 struct usb_config_descriptor *config = 192 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 193 unsigned int length = le16_to_cpu(config->wTotalLength); 194 195 if (*ppos < pos + length) { 196 197 /* The descriptor may claim to be longer than it 198 * really is. Here is the actual allocated length. */ 199 unsigned alloclen = 200 le16_to_cpu(dev->config[i].desc.wTotalLength); 201 202 len = length - (*ppos - pos); 203 if (len > nbytes) 204 len = nbytes; 205 206 /* Simply don't write (skip over) unallocated parts */ 207 if (alloclen > (*ppos - pos)) { 208 alloclen -= (*ppos - pos); 209 if (copy_to_user(buf, 210 dev->rawdescriptors[i] + (*ppos - pos), 211 min(len, alloclen))) { 212 ret = -EFAULT; 213 goto err; 214 } 215 } 216 217 *ppos += len; 218 buf += len; 219 nbytes -= len; 220 ret += len; 221 } 222 223 pos += length; 224 } 225 226 err: 227 usb_unlock_device(dev); 228 return ret; 229 } 230 231 /* 232 * async list handling 233 */ 234 235 static struct async *alloc_async(unsigned int numisoframes) 236 { 237 struct async *as; 238 239 as = kzalloc(sizeof(struct async), GFP_KERNEL); 240 if (!as) 241 return NULL; 242 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 243 if (!as->urb) { 244 kfree(as); 245 return NULL; 246 } 247 return as; 248 } 249 250 static void free_async(struct async *as) 251 { 252 put_pid(as->pid); 253 kfree(as->urb->transfer_buffer); 254 kfree(as->urb->setup_packet); 255 usb_free_urb(as->urb); 256 kfree(as); 257 } 258 259 static void async_newpending(struct async *as) 260 { 261 struct dev_state *ps = as->ps; 262 unsigned long flags; 263 264 spin_lock_irqsave(&ps->lock, flags); 265 list_add_tail(&as->asynclist, &ps->async_pending); 266 spin_unlock_irqrestore(&ps->lock, flags); 267 } 268 269 static void async_removepending(struct async *as) 270 { 271 struct dev_state *ps = as->ps; 272 unsigned long flags; 273 274 spin_lock_irqsave(&ps->lock, flags); 275 list_del_init(&as->asynclist); 276 spin_unlock_irqrestore(&ps->lock, flags); 277 } 278 279 static struct async *async_getcompleted(struct dev_state *ps) 280 { 281 unsigned long flags; 282 struct async *as = NULL; 283 284 spin_lock_irqsave(&ps->lock, flags); 285 if (!list_empty(&ps->async_completed)) { 286 as = list_entry(ps->async_completed.next, struct async, 287 asynclist); 288 list_del_init(&as->asynclist); 289 } 290 spin_unlock_irqrestore(&ps->lock, flags); 291 return as; 292 } 293 294 static struct async *async_getpending(struct dev_state *ps, 295 void __user *userurb) 296 { 297 unsigned long flags; 298 struct async *as; 299 300 spin_lock_irqsave(&ps->lock, flags); 301 list_for_each_entry(as, &ps->async_pending, asynclist) 302 if (as->userurb == userurb) { 303 list_del_init(&as->asynclist); 304 spin_unlock_irqrestore(&ps->lock, flags); 305 return as; 306 } 307 spin_unlock_irqrestore(&ps->lock, flags); 308 return NULL; 309 } 310 311 static void snoop_urb(struct usb_device *udev, 312 void __user *userurb, int pipe, unsigned length, 313 int timeout_or_status, enum snoop_when when) 314 { 315 static const char *types[] = {"isoc", "int", "ctrl", "bulk"}; 316 static const char *dirs[] = {"out", "in"}; 317 int ep; 318 const char *t, *d; 319 320 if (!usbfs_snoop) 321 return; 322 323 ep = usb_pipeendpoint(pipe); 324 t = types[usb_pipetype(pipe)]; 325 d = dirs[!!usb_pipein(pipe)]; 326 327 if (userurb) { /* Async */ 328 if (when == SUBMIT) 329 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 330 "length %u\n", 331 userurb, ep, t, d, length); 332 else 333 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, " 334 "actual_length %u status %d\n", 335 userurb, ep, t, d, length, 336 timeout_or_status); 337 } else { 338 if (when == SUBMIT) 339 dev_info(&udev->dev, "ep%d %s-%s, length %u, " 340 "timeout %d\n", 341 ep, t, d, length, timeout_or_status); 342 else 343 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, " 344 "status %d\n", 345 ep, t, d, length, timeout_or_status); 346 } 347 } 348 349 #define AS_CONTINUATION 1 350 #define AS_UNLINK 2 351 352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr) 353 __releases(ps->lock) 354 __acquires(ps->lock) 355 { 356 struct async *as; 357 358 /* Mark all the pending URBs that match bulk_addr, up to but not 359 * including the first one without AS_CONTINUATION. If such an 360 * URB is encountered then a new transfer has already started so 361 * the endpoint doesn't need to be disabled; otherwise it does. 362 */ 363 list_for_each_entry(as, &ps->async_pending, asynclist) { 364 if (as->bulk_addr == bulk_addr) { 365 if (as->bulk_status != AS_CONTINUATION) 366 goto rescan; 367 as->bulk_status = AS_UNLINK; 368 as->bulk_addr = 0; 369 } 370 } 371 ps->disabled_bulk_eps |= (1 << bulk_addr); 372 373 /* Now carefully unlink all the marked pending URBs */ 374 rescan: 375 list_for_each_entry(as, &ps->async_pending, asynclist) { 376 if (as->bulk_status == AS_UNLINK) { 377 as->bulk_status = 0; /* Only once */ 378 spin_unlock(&ps->lock); /* Allow completions */ 379 usb_unlink_urb(as->urb); 380 spin_lock(&ps->lock); 381 goto rescan; 382 } 383 } 384 } 385 386 static void async_completed(struct urb *urb) 387 { 388 struct async *as = urb->context; 389 struct dev_state *ps = as->ps; 390 struct siginfo sinfo; 391 struct pid *pid = NULL; 392 uid_t uid = 0; 393 uid_t euid = 0; 394 u32 secid = 0; 395 int signr; 396 397 spin_lock(&ps->lock); 398 list_move_tail(&as->asynclist, &ps->async_completed); 399 as->status = urb->status; 400 signr = as->signr; 401 if (signr) { 402 sinfo.si_signo = as->signr; 403 sinfo.si_errno = as->status; 404 sinfo.si_code = SI_ASYNCIO; 405 sinfo.si_addr = as->userurb; 406 pid = as->pid; 407 uid = as->uid; 408 euid = as->euid; 409 secid = as->secid; 410 } 411 snoop(&urb->dev->dev, "urb complete\n"); 412 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length, 413 as->status, COMPLETE); 414 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET && 415 as->status != -ENOENT) 416 cancel_bulk_urbs(ps, as->bulk_addr); 417 spin_unlock(&ps->lock); 418 419 if (signr) 420 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid, 421 euid, secid); 422 423 wake_up(&ps->wait); 424 } 425 426 static void destroy_async(struct dev_state *ps, struct list_head *list) 427 { 428 struct async *as; 429 unsigned long flags; 430 431 spin_lock_irqsave(&ps->lock, flags); 432 while (!list_empty(list)) { 433 as = list_entry(list->next, struct async, asynclist); 434 list_del_init(&as->asynclist); 435 436 /* drop the spinlock so the completion handler can run */ 437 spin_unlock_irqrestore(&ps->lock, flags); 438 usb_kill_urb(as->urb); 439 spin_lock_irqsave(&ps->lock, flags); 440 } 441 spin_unlock_irqrestore(&ps->lock, flags); 442 } 443 444 static void destroy_async_on_interface(struct dev_state *ps, 445 unsigned int ifnum) 446 { 447 struct list_head *p, *q, hitlist; 448 unsigned long flags; 449 450 INIT_LIST_HEAD(&hitlist); 451 spin_lock_irqsave(&ps->lock, flags); 452 list_for_each_safe(p, q, &ps->async_pending) 453 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 454 list_move_tail(p, &hitlist); 455 spin_unlock_irqrestore(&ps->lock, flags); 456 destroy_async(ps, &hitlist); 457 } 458 459 static void destroy_all_async(struct dev_state *ps) 460 { 461 destroy_async(ps, &ps->async_pending); 462 } 463 464 /* 465 * interface claims are made only at the request of user level code, 466 * which can also release them (explicitly or by closing files). 467 * they're also undone when devices disconnect. 468 */ 469 470 static int driver_probe(struct usb_interface *intf, 471 const struct usb_device_id *id) 472 { 473 return -ENODEV; 474 } 475 476 static void driver_disconnect(struct usb_interface *intf) 477 { 478 struct dev_state *ps = usb_get_intfdata(intf); 479 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 480 481 if (!ps) 482 return; 483 484 /* NOTE: this relies on usbcore having canceled and completed 485 * all pending I/O requests; 2.6 does that. 486 */ 487 488 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 489 clear_bit(ifnum, &ps->ifclaimed); 490 else 491 dev_warn(&intf->dev, "interface number %u out of range\n", 492 ifnum); 493 494 usb_set_intfdata(intf, NULL); 495 496 /* force async requests to complete */ 497 destroy_async_on_interface(ps, ifnum); 498 } 499 500 /* The following routines are merely placeholders. There is no way 501 * to inform a user task about suspend or resumes. 502 */ 503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 504 { 505 return 0; 506 } 507 508 static int driver_resume(struct usb_interface *intf) 509 { 510 return 0; 511 } 512 513 struct usb_driver usbfs_driver = { 514 .name = "usbfs", 515 .probe = driver_probe, 516 .disconnect = driver_disconnect, 517 .suspend = driver_suspend, 518 .resume = driver_resume, 519 }; 520 521 static int claimintf(struct dev_state *ps, unsigned int ifnum) 522 { 523 struct usb_device *dev = ps->dev; 524 struct usb_interface *intf; 525 int err; 526 527 if (ifnum >= 8*sizeof(ps->ifclaimed)) 528 return -EINVAL; 529 /* already claimed */ 530 if (test_bit(ifnum, &ps->ifclaimed)) 531 return 0; 532 533 intf = usb_ifnum_to_if(dev, ifnum); 534 if (!intf) 535 err = -ENOENT; 536 else 537 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 538 if (err == 0) 539 set_bit(ifnum, &ps->ifclaimed); 540 return err; 541 } 542 543 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 544 { 545 struct usb_device *dev; 546 struct usb_interface *intf; 547 int err; 548 549 err = -EINVAL; 550 if (ifnum >= 8*sizeof(ps->ifclaimed)) 551 return err; 552 dev = ps->dev; 553 intf = usb_ifnum_to_if(dev, ifnum); 554 if (!intf) 555 err = -ENOENT; 556 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 557 usb_driver_release_interface(&usbfs_driver, intf); 558 err = 0; 559 } 560 return err; 561 } 562 563 static int checkintf(struct dev_state *ps, unsigned int ifnum) 564 { 565 if (ps->dev->state != USB_STATE_CONFIGURED) 566 return -EHOSTUNREACH; 567 if (ifnum >= 8*sizeof(ps->ifclaimed)) 568 return -EINVAL; 569 if (test_bit(ifnum, &ps->ifclaimed)) 570 return 0; 571 /* if not yet claimed, claim it for the driver */ 572 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 573 "interface %u before use\n", task_pid_nr(current), 574 current->comm, ifnum); 575 return claimintf(ps, ifnum); 576 } 577 578 static int findintfep(struct usb_device *dev, unsigned int ep) 579 { 580 unsigned int i, j, e; 581 struct usb_interface *intf; 582 struct usb_host_interface *alts; 583 struct usb_endpoint_descriptor *endpt; 584 585 if (ep & ~(USB_DIR_IN|0xf)) 586 return -EINVAL; 587 if (!dev->actconfig) 588 return -ESRCH; 589 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 590 intf = dev->actconfig->interface[i]; 591 for (j = 0; j < intf->num_altsetting; j++) { 592 alts = &intf->altsetting[j]; 593 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 594 endpt = &alts->endpoint[e].desc; 595 if (endpt->bEndpointAddress == ep) 596 return alts->desc.bInterfaceNumber; 597 } 598 } 599 } 600 return -ENOENT; 601 } 602 603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 604 unsigned int index) 605 { 606 int ret = 0; 607 608 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 609 && ps->dev->state != USB_STATE_ADDRESS 610 && ps->dev->state != USB_STATE_CONFIGURED) 611 return -EHOSTUNREACH; 612 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 613 return 0; 614 615 index &= 0xff; 616 switch (requesttype & USB_RECIP_MASK) { 617 case USB_RECIP_ENDPOINT: 618 ret = findintfep(ps->dev, index); 619 if (ret >= 0) 620 ret = checkintf(ps, ret); 621 break; 622 623 case USB_RECIP_INTERFACE: 624 ret = checkintf(ps, index); 625 break; 626 } 627 return ret; 628 } 629 630 static int match_devt(struct device *dev, void *data) 631 { 632 return dev->devt == (dev_t) (unsigned long) data; 633 } 634 635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 636 { 637 struct device *dev; 638 639 dev = bus_find_device(&usb_bus_type, NULL, 640 (void *) (unsigned long) devt, match_devt); 641 if (!dev) 642 return NULL; 643 return container_of(dev, struct usb_device, dev); 644 } 645 646 /* 647 * file operations 648 */ 649 static int usbdev_open(struct inode *inode, struct file *file) 650 { 651 struct usb_device *dev = NULL; 652 struct dev_state *ps; 653 const struct cred *cred = current_cred(); 654 int ret; 655 656 lock_kernel(); 657 /* Protect against simultaneous removal or release */ 658 mutex_lock(&usbfs_mutex); 659 660 ret = -ENOMEM; 661 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 662 if (!ps) 663 goto out; 664 665 ret = -ENODEV; 666 667 /* usbdev device-node */ 668 if (imajor(inode) == USB_DEVICE_MAJOR) 669 dev = usbdev_lookup_by_devt(inode->i_rdev); 670 #ifdef CONFIG_USB_DEVICEFS 671 /* procfs file */ 672 if (!dev) { 673 dev = inode->i_private; 674 if (dev && dev->usbfs_dentry && 675 dev->usbfs_dentry->d_inode == inode) 676 usb_get_dev(dev); 677 else 678 dev = NULL; 679 } 680 #endif 681 if (!dev || dev->state == USB_STATE_NOTATTACHED) 682 goto out; 683 ret = usb_autoresume_device(dev); 684 if (ret) 685 goto out; 686 687 ret = 0; 688 ps->dev = dev; 689 ps->file = file; 690 spin_lock_init(&ps->lock); 691 INIT_LIST_HEAD(&ps->list); 692 INIT_LIST_HEAD(&ps->async_pending); 693 INIT_LIST_HEAD(&ps->async_completed); 694 init_waitqueue_head(&ps->wait); 695 ps->discsignr = 0; 696 ps->disc_pid = get_pid(task_pid(current)); 697 ps->disc_uid = cred->uid; 698 ps->disc_euid = cred->euid; 699 ps->disccontext = NULL; 700 ps->ifclaimed = 0; 701 security_task_getsecid(current, &ps->secid); 702 smp_wmb(); 703 list_add_tail(&ps->list, &dev->filelist); 704 file->private_data = ps; 705 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 706 current->comm); 707 out: 708 if (ret) { 709 kfree(ps); 710 usb_put_dev(dev); 711 } 712 mutex_unlock(&usbfs_mutex); 713 unlock_kernel(); 714 return ret; 715 } 716 717 static int usbdev_release(struct inode *inode, struct file *file) 718 { 719 struct dev_state *ps = file->private_data; 720 struct usb_device *dev = ps->dev; 721 unsigned int ifnum; 722 struct async *as; 723 724 usb_lock_device(dev); 725 usb_hub_release_all_ports(dev, ps); 726 727 /* Protect against simultaneous open */ 728 mutex_lock(&usbfs_mutex); 729 list_del_init(&ps->list); 730 mutex_unlock(&usbfs_mutex); 731 732 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 733 ifnum++) { 734 if (test_bit(ifnum, &ps->ifclaimed)) 735 releaseintf(ps, ifnum); 736 } 737 destroy_all_async(ps); 738 usb_autosuspend_device(dev); 739 usb_unlock_device(dev); 740 usb_put_dev(dev); 741 put_pid(ps->disc_pid); 742 743 as = async_getcompleted(ps); 744 while (as) { 745 free_async(as); 746 as = async_getcompleted(ps); 747 } 748 kfree(ps); 749 return 0; 750 } 751 752 static int proc_control(struct dev_state *ps, void __user *arg) 753 { 754 struct usb_device *dev = ps->dev; 755 struct usbdevfs_ctrltransfer ctrl; 756 unsigned int tmo; 757 unsigned char *tbuf; 758 unsigned wLength; 759 int i, pipe, ret; 760 761 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 762 return -EFAULT; 763 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 764 if (ret) 765 return ret; 766 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 767 if (wLength > PAGE_SIZE) 768 return -EINVAL; 769 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 770 if (!tbuf) 771 return -ENOMEM; 772 tmo = ctrl.timeout; 773 if (ctrl.bRequestType & 0x80) { 774 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 775 ctrl.wLength)) { 776 free_page((unsigned long)tbuf); 777 return -EINVAL; 778 } 779 pipe = usb_rcvctrlpipe(dev, 0); 780 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT); 781 782 usb_unlock_device(dev); 783 i = usb_control_msg(dev, pipe, ctrl.bRequest, 784 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 785 tbuf, ctrl.wLength, tmo); 786 usb_lock_device(dev); 787 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE); 788 789 if ((i > 0) && ctrl.wLength) { 790 if (copy_to_user(ctrl.data, tbuf, i)) { 791 free_page((unsigned long)tbuf); 792 return -EFAULT; 793 } 794 } 795 } else { 796 if (ctrl.wLength) { 797 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 798 free_page((unsigned long)tbuf); 799 return -EFAULT; 800 } 801 } 802 pipe = usb_sndctrlpipe(dev, 0); 803 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT); 804 805 usb_unlock_device(dev); 806 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 807 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 808 tbuf, ctrl.wLength, tmo); 809 usb_lock_device(dev); 810 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE); 811 } 812 free_page((unsigned long)tbuf); 813 if (i < 0 && i != -EPIPE) { 814 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 815 "failed cmd %s rqt %u rq %u len %u ret %d\n", 816 current->comm, ctrl.bRequestType, ctrl.bRequest, 817 ctrl.wLength, i); 818 } 819 return i; 820 } 821 822 static int proc_bulk(struct dev_state *ps, void __user *arg) 823 { 824 struct usb_device *dev = ps->dev; 825 struct usbdevfs_bulktransfer bulk; 826 unsigned int tmo, len1, pipe; 827 int len2; 828 unsigned char *tbuf; 829 int i, ret; 830 831 if (copy_from_user(&bulk, arg, sizeof(bulk))) 832 return -EFAULT; 833 ret = findintfep(ps->dev, bulk.ep); 834 if (ret < 0) 835 return ret; 836 ret = checkintf(ps, ret); 837 if (ret) 838 return ret; 839 if (bulk.ep & USB_DIR_IN) 840 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 841 else 842 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 843 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 844 return -EINVAL; 845 len1 = bulk.len; 846 if (len1 > MAX_USBFS_BUFFER_SIZE) 847 return -EINVAL; 848 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 849 return -ENOMEM; 850 tmo = bulk.timeout; 851 if (bulk.ep & 0x80) { 852 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 853 kfree(tbuf); 854 return -EINVAL; 855 } 856 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT); 857 858 usb_unlock_device(dev); 859 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 860 usb_lock_device(dev); 861 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE); 862 863 if (!i && len2) { 864 if (copy_to_user(bulk.data, tbuf, len2)) { 865 kfree(tbuf); 866 return -EFAULT; 867 } 868 } 869 } else { 870 if (len1) { 871 if (copy_from_user(tbuf, bulk.data, len1)) { 872 kfree(tbuf); 873 return -EFAULT; 874 } 875 } 876 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT); 877 878 usb_unlock_device(dev); 879 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 880 usb_lock_device(dev); 881 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE); 882 } 883 kfree(tbuf); 884 if (i < 0) 885 return i; 886 return len2; 887 } 888 889 static int proc_resetep(struct dev_state *ps, void __user *arg) 890 { 891 unsigned int ep; 892 int ret; 893 894 if (get_user(ep, (unsigned int __user *)arg)) 895 return -EFAULT; 896 ret = findintfep(ps->dev, ep); 897 if (ret < 0) 898 return ret; 899 ret = checkintf(ps, ret); 900 if (ret) 901 return ret; 902 usb_reset_endpoint(ps->dev, ep); 903 return 0; 904 } 905 906 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 907 { 908 unsigned int ep; 909 int pipe; 910 int ret; 911 912 if (get_user(ep, (unsigned int __user *)arg)) 913 return -EFAULT; 914 ret = findintfep(ps->dev, ep); 915 if (ret < 0) 916 return ret; 917 ret = checkintf(ps, ret); 918 if (ret) 919 return ret; 920 if (ep & USB_DIR_IN) 921 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 922 else 923 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 924 925 return usb_clear_halt(ps->dev, pipe); 926 } 927 928 static int proc_getdriver(struct dev_state *ps, void __user *arg) 929 { 930 struct usbdevfs_getdriver gd; 931 struct usb_interface *intf; 932 int ret; 933 934 if (copy_from_user(&gd, arg, sizeof(gd))) 935 return -EFAULT; 936 intf = usb_ifnum_to_if(ps->dev, gd.interface); 937 if (!intf || !intf->dev.driver) 938 ret = -ENODATA; 939 else { 940 strncpy(gd.driver, intf->dev.driver->name, 941 sizeof(gd.driver)); 942 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 943 } 944 return ret; 945 } 946 947 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 948 { 949 struct usbdevfs_connectinfo ci; 950 951 ci.devnum = ps->dev->devnum; 952 ci.slow = ps->dev->speed == USB_SPEED_LOW; 953 if (copy_to_user(arg, &ci, sizeof(ci))) 954 return -EFAULT; 955 return 0; 956 } 957 958 static int proc_resetdevice(struct dev_state *ps) 959 { 960 return usb_reset_device(ps->dev); 961 } 962 963 static int proc_setintf(struct dev_state *ps, void __user *arg) 964 { 965 struct usbdevfs_setinterface setintf; 966 int ret; 967 968 if (copy_from_user(&setintf, arg, sizeof(setintf))) 969 return -EFAULT; 970 if ((ret = checkintf(ps, setintf.interface))) 971 return ret; 972 return usb_set_interface(ps->dev, setintf.interface, 973 setintf.altsetting); 974 } 975 976 static int proc_setconfig(struct dev_state *ps, void __user *arg) 977 { 978 int u; 979 int status = 0; 980 struct usb_host_config *actconfig; 981 982 if (get_user(u, (int __user *)arg)) 983 return -EFAULT; 984 985 actconfig = ps->dev->actconfig; 986 987 /* Don't touch the device if any interfaces are claimed. 988 * It could interfere with other drivers' operations, and if 989 * an interface is claimed by usbfs it could easily deadlock. 990 */ 991 if (actconfig) { 992 int i; 993 994 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 995 if (usb_interface_claimed(actconfig->interface[i])) { 996 dev_warn(&ps->dev->dev, 997 "usbfs: interface %d claimed by %s " 998 "while '%s' sets config #%d\n", 999 actconfig->interface[i] 1000 ->cur_altsetting 1001 ->desc.bInterfaceNumber, 1002 actconfig->interface[i] 1003 ->dev.driver->name, 1004 current->comm, u); 1005 status = -EBUSY; 1006 break; 1007 } 1008 } 1009 } 1010 1011 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 1012 * so avoid usb_set_configuration()'s kick to sysfs 1013 */ 1014 if (status == 0) { 1015 if (actconfig && actconfig->desc.bConfigurationValue == u) 1016 status = usb_reset_configuration(ps->dev); 1017 else 1018 status = usb_set_configuration(ps->dev, u); 1019 } 1020 1021 return status; 1022 } 1023 1024 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 1025 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 1026 void __user *arg) 1027 { 1028 struct usbdevfs_iso_packet_desc *isopkt = NULL; 1029 struct usb_host_endpoint *ep; 1030 struct async *as; 1031 struct usb_ctrlrequest *dr = NULL; 1032 const struct cred *cred = current_cred(); 1033 unsigned int u, totlen, isofrmlen; 1034 int ret, ifnum = -1; 1035 int is_in; 1036 1037 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 1038 USBDEVFS_URB_SHORT_NOT_OK | 1039 USBDEVFS_URB_BULK_CONTINUATION | 1040 USBDEVFS_URB_NO_FSBR | 1041 USBDEVFS_URB_ZERO_PACKET | 1042 USBDEVFS_URB_NO_INTERRUPT)) 1043 return -EINVAL; 1044 if (uurb->buffer_length > 0 && !uurb->buffer) 1045 return -EINVAL; 1046 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 1047 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 1048 ifnum = findintfep(ps->dev, uurb->endpoint); 1049 if (ifnum < 0) 1050 return ifnum; 1051 ret = checkintf(ps, ifnum); 1052 if (ret) 1053 return ret; 1054 } 1055 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 1056 is_in = 1; 1057 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1058 } else { 1059 is_in = 0; 1060 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1061 } 1062 if (!ep) 1063 return -ENOENT; 1064 switch(uurb->type) { 1065 case USBDEVFS_URB_TYPE_CONTROL: 1066 if (!usb_endpoint_xfer_control(&ep->desc)) 1067 return -EINVAL; 1068 /* min 8 byte setup packet, 1069 * max 8 byte setup plus an arbitrary data stage */ 1070 if (uurb->buffer_length < 8 || 1071 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 1072 return -EINVAL; 1073 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1074 if (!dr) 1075 return -ENOMEM; 1076 if (copy_from_user(dr, uurb->buffer, 8)) { 1077 kfree(dr); 1078 return -EFAULT; 1079 } 1080 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1081 kfree(dr); 1082 return -EINVAL; 1083 } 1084 ret = check_ctrlrecip(ps, dr->bRequestType, 1085 le16_to_cpup(&dr->wIndex)); 1086 if (ret) { 1087 kfree(dr); 1088 return ret; 1089 } 1090 uurb->number_of_packets = 0; 1091 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1092 uurb->buffer += 8; 1093 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1094 is_in = 1; 1095 uurb->endpoint |= USB_DIR_IN; 1096 } else { 1097 is_in = 0; 1098 uurb->endpoint &= ~USB_DIR_IN; 1099 } 1100 break; 1101 1102 case USBDEVFS_URB_TYPE_BULK: 1103 switch (usb_endpoint_type(&ep->desc)) { 1104 case USB_ENDPOINT_XFER_CONTROL: 1105 case USB_ENDPOINT_XFER_ISOC: 1106 return -EINVAL; 1107 /* allow single-shot interrupt transfers, at bogus rates */ 1108 } 1109 uurb->number_of_packets = 0; 1110 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1111 return -EINVAL; 1112 break; 1113 1114 case USBDEVFS_URB_TYPE_ISO: 1115 /* arbitrary limit */ 1116 if (uurb->number_of_packets < 1 || 1117 uurb->number_of_packets > 128) 1118 return -EINVAL; 1119 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1120 return -EINVAL; 1121 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1122 uurb->number_of_packets; 1123 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1124 return -ENOMEM; 1125 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1126 kfree(isopkt); 1127 return -EFAULT; 1128 } 1129 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1130 /* arbitrary limit, 1131 * sufficient for USB 2.0 high-bandwidth iso */ 1132 if (isopkt[u].length > 8192) { 1133 kfree(isopkt); 1134 return -EINVAL; 1135 } 1136 totlen += isopkt[u].length; 1137 } 1138 /* 3072 * 64 microframes */ 1139 if (totlen > 196608) { 1140 kfree(isopkt); 1141 return -EINVAL; 1142 } 1143 uurb->buffer_length = totlen; 1144 break; 1145 1146 case USBDEVFS_URB_TYPE_INTERRUPT: 1147 uurb->number_of_packets = 0; 1148 if (!usb_endpoint_xfer_int(&ep->desc)) 1149 return -EINVAL; 1150 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1151 return -EINVAL; 1152 break; 1153 1154 default: 1155 return -EINVAL; 1156 } 1157 if (uurb->buffer_length > 0 && 1158 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1159 uurb->buffer, uurb->buffer_length)) { 1160 kfree(isopkt); 1161 kfree(dr); 1162 return -EFAULT; 1163 } 1164 as = alloc_async(uurb->number_of_packets); 1165 if (!as) { 1166 kfree(isopkt); 1167 kfree(dr); 1168 return -ENOMEM; 1169 } 1170 if (uurb->buffer_length > 0) { 1171 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, 1172 GFP_KERNEL); 1173 if (!as->urb->transfer_buffer) { 1174 kfree(isopkt); 1175 kfree(dr); 1176 free_async(as); 1177 return -ENOMEM; 1178 } 1179 } 1180 as->urb->dev = ps->dev; 1181 as->urb->pipe = (uurb->type << 30) | 1182 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1183 (uurb->endpoint & USB_DIR_IN); 1184 1185 /* This tedious sequence is necessary because the URB_* flags 1186 * are internal to the kernel and subject to change, whereas 1187 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1188 */ 1189 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1190 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1191 u |= URB_ISO_ASAP; 1192 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1193 u |= URB_SHORT_NOT_OK; 1194 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1195 u |= URB_NO_FSBR; 1196 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1197 u |= URB_ZERO_PACKET; 1198 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1199 u |= URB_NO_INTERRUPT; 1200 as->urb->transfer_flags = u; 1201 1202 as->urb->transfer_buffer_length = uurb->buffer_length; 1203 as->urb->setup_packet = (unsigned char *)dr; 1204 as->urb->start_frame = uurb->start_frame; 1205 as->urb->number_of_packets = uurb->number_of_packets; 1206 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1207 ps->dev->speed == USB_SPEED_HIGH) 1208 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1209 else 1210 as->urb->interval = ep->desc.bInterval; 1211 as->urb->context = as; 1212 as->urb->complete = async_completed; 1213 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1214 as->urb->iso_frame_desc[u].offset = totlen; 1215 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1216 totlen += isopkt[u].length; 1217 } 1218 kfree(isopkt); 1219 as->ps = ps; 1220 as->userurb = arg; 1221 if (is_in && uurb->buffer_length > 0) 1222 as->userbuffer = uurb->buffer; 1223 else 1224 as->userbuffer = NULL; 1225 as->signr = uurb->signr; 1226 as->ifnum = ifnum; 1227 as->pid = get_pid(task_pid(current)); 1228 as->uid = cred->uid; 1229 as->euid = cred->euid; 1230 security_task_getsecid(current, &as->secid); 1231 if (!is_in && uurb->buffer_length > 0) { 1232 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1233 uurb->buffer_length)) { 1234 free_async(as); 1235 return -EFAULT; 1236 } 1237 } 1238 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1239 as->urb->transfer_buffer_length, 0, SUBMIT); 1240 async_newpending(as); 1241 1242 if (usb_endpoint_xfer_bulk(&ep->desc)) { 1243 spin_lock_irq(&ps->lock); 1244 1245 /* Not exactly the endpoint address; the direction bit is 1246 * shifted to the 0x10 position so that the value will be 1247 * between 0 and 31. 1248 */ 1249 as->bulk_addr = usb_endpoint_num(&ep->desc) | 1250 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) 1251 >> 3); 1252 1253 /* If this bulk URB is the start of a new transfer, re-enable 1254 * the endpoint. Otherwise mark it as a continuation URB. 1255 */ 1256 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION) 1257 as->bulk_status = AS_CONTINUATION; 1258 else 1259 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr); 1260 1261 /* Don't accept continuation URBs if the endpoint is 1262 * disabled because of an earlier error. 1263 */ 1264 if (ps->disabled_bulk_eps & (1 << as->bulk_addr)) 1265 ret = -EREMOTEIO; 1266 else 1267 ret = usb_submit_urb(as->urb, GFP_ATOMIC); 1268 spin_unlock_irq(&ps->lock); 1269 } else { 1270 ret = usb_submit_urb(as->urb, GFP_KERNEL); 1271 } 1272 1273 if (ret) { 1274 dev_printk(KERN_DEBUG, &ps->dev->dev, 1275 "usbfs: usb_submit_urb returned %d\n", ret); 1276 snoop_urb(ps->dev, as->userurb, as->urb->pipe, 1277 0, ret, COMPLETE); 1278 async_removepending(as); 1279 free_async(as); 1280 return ret; 1281 } 1282 return 0; 1283 } 1284 1285 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1286 { 1287 struct usbdevfs_urb uurb; 1288 1289 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1290 return -EFAULT; 1291 1292 return proc_do_submiturb(ps, &uurb, 1293 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1294 arg); 1295 } 1296 1297 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1298 { 1299 struct async *as; 1300 1301 as = async_getpending(ps, arg); 1302 if (!as) 1303 return -EINVAL; 1304 usb_kill_urb(as->urb); 1305 return 0; 1306 } 1307 1308 static int processcompl(struct async *as, void __user * __user *arg) 1309 { 1310 struct urb *urb = as->urb; 1311 struct usbdevfs_urb __user *userurb = as->userurb; 1312 void __user *addr = as->userurb; 1313 unsigned int i; 1314 1315 if (as->userbuffer) 1316 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1317 urb->transfer_buffer_length)) 1318 goto err_out; 1319 if (put_user(as->status, &userurb->status)) 1320 goto err_out; 1321 if (put_user(urb->actual_length, &userurb->actual_length)) 1322 goto err_out; 1323 if (put_user(urb->error_count, &userurb->error_count)) 1324 goto err_out; 1325 1326 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1327 for (i = 0; i < urb->number_of_packets; i++) { 1328 if (put_user(urb->iso_frame_desc[i].actual_length, 1329 &userurb->iso_frame_desc[i].actual_length)) 1330 goto err_out; 1331 if (put_user(urb->iso_frame_desc[i].status, 1332 &userurb->iso_frame_desc[i].status)) 1333 goto err_out; 1334 } 1335 } 1336 1337 free_async(as); 1338 1339 if (put_user(addr, (void __user * __user *)arg)) 1340 return -EFAULT; 1341 return 0; 1342 1343 err_out: 1344 free_async(as); 1345 return -EFAULT; 1346 } 1347 1348 static struct async *reap_as(struct dev_state *ps) 1349 { 1350 DECLARE_WAITQUEUE(wait, current); 1351 struct async *as = NULL; 1352 struct usb_device *dev = ps->dev; 1353 1354 add_wait_queue(&ps->wait, &wait); 1355 for (;;) { 1356 __set_current_state(TASK_INTERRUPTIBLE); 1357 as = async_getcompleted(ps); 1358 if (as) 1359 break; 1360 if (signal_pending(current)) 1361 break; 1362 usb_unlock_device(dev); 1363 schedule(); 1364 usb_lock_device(dev); 1365 } 1366 remove_wait_queue(&ps->wait, &wait); 1367 set_current_state(TASK_RUNNING); 1368 return as; 1369 } 1370 1371 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1372 { 1373 struct async *as = reap_as(ps); 1374 if (as) 1375 return processcompl(as, (void __user * __user *)arg); 1376 if (signal_pending(current)) 1377 return -EINTR; 1378 return -EIO; 1379 } 1380 1381 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1382 { 1383 struct async *as; 1384 1385 if (!(as = async_getcompleted(ps))) 1386 return -EAGAIN; 1387 return processcompl(as, (void __user * __user *)arg); 1388 } 1389 1390 #ifdef CONFIG_COMPAT 1391 1392 static int get_urb32(struct usbdevfs_urb *kurb, 1393 struct usbdevfs_urb32 __user *uurb) 1394 { 1395 __u32 uptr; 1396 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || 1397 __get_user(kurb->type, &uurb->type) || 1398 __get_user(kurb->endpoint, &uurb->endpoint) || 1399 __get_user(kurb->status, &uurb->status) || 1400 __get_user(kurb->flags, &uurb->flags) || 1401 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1402 __get_user(kurb->actual_length, &uurb->actual_length) || 1403 __get_user(kurb->start_frame, &uurb->start_frame) || 1404 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1405 __get_user(kurb->error_count, &uurb->error_count) || 1406 __get_user(kurb->signr, &uurb->signr)) 1407 return -EFAULT; 1408 1409 if (__get_user(uptr, &uurb->buffer)) 1410 return -EFAULT; 1411 kurb->buffer = compat_ptr(uptr); 1412 if (__get_user(uptr, &uurb->usercontext)) 1413 return -EFAULT; 1414 kurb->usercontext = compat_ptr(uptr); 1415 1416 return 0; 1417 } 1418 1419 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1420 { 1421 struct usbdevfs_urb uurb; 1422 1423 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1424 return -EFAULT; 1425 1426 return proc_do_submiturb(ps, &uurb, 1427 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1428 arg); 1429 } 1430 1431 static int processcompl_compat(struct async *as, void __user * __user *arg) 1432 { 1433 struct urb *urb = as->urb; 1434 struct usbdevfs_urb32 __user *userurb = as->userurb; 1435 void __user *addr = as->userurb; 1436 unsigned int i; 1437 1438 if (as->userbuffer) 1439 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1440 urb->transfer_buffer_length)) 1441 return -EFAULT; 1442 if (put_user(as->status, &userurb->status)) 1443 return -EFAULT; 1444 if (put_user(urb->actual_length, &userurb->actual_length)) 1445 return -EFAULT; 1446 if (put_user(urb->error_count, &userurb->error_count)) 1447 return -EFAULT; 1448 1449 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1450 for (i = 0; i < urb->number_of_packets; i++) { 1451 if (put_user(urb->iso_frame_desc[i].actual_length, 1452 &userurb->iso_frame_desc[i].actual_length)) 1453 return -EFAULT; 1454 if (put_user(urb->iso_frame_desc[i].status, 1455 &userurb->iso_frame_desc[i].status)) 1456 return -EFAULT; 1457 } 1458 } 1459 1460 free_async(as); 1461 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1462 return -EFAULT; 1463 return 0; 1464 } 1465 1466 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1467 { 1468 struct async *as = reap_as(ps); 1469 if (as) 1470 return processcompl_compat(as, (void __user * __user *)arg); 1471 if (signal_pending(current)) 1472 return -EINTR; 1473 return -EIO; 1474 } 1475 1476 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1477 { 1478 struct async *as; 1479 1480 if (!(as = async_getcompleted(ps))) 1481 return -EAGAIN; 1482 return processcompl_compat(as, (void __user * __user *)arg); 1483 } 1484 1485 #endif 1486 1487 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1488 { 1489 struct usbdevfs_disconnectsignal ds; 1490 1491 if (copy_from_user(&ds, arg, sizeof(ds))) 1492 return -EFAULT; 1493 ps->discsignr = ds.signr; 1494 ps->disccontext = ds.context; 1495 return 0; 1496 } 1497 1498 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1499 { 1500 unsigned int ifnum; 1501 1502 if (get_user(ifnum, (unsigned int __user *)arg)) 1503 return -EFAULT; 1504 return claimintf(ps, ifnum); 1505 } 1506 1507 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1508 { 1509 unsigned int ifnum; 1510 int ret; 1511 1512 if (get_user(ifnum, (unsigned int __user *)arg)) 1513 return -EFAULT; 1514 if ((ret = releaseintf(ps, ifnum)) < 0) 1515 return ret; 1516 destroy_async_on_interface (ps, ifnum); 1517 return 0; 1518 } 1519 1520 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1521 { 1522 int size; 1523 void *buf = NULL; 1524 int retval = 0; 1525 struct usb_interface *intf = NULL; 1526 struct usb_driver *driver = NULL; 1527 1528 /* alloc buffer */ 1529 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1530 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1531 return -ENOMEM; 1532 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1533 if (copy_from_user(buf, ctl->data, size)) { 1534 kfree(buf); 1535 return -EFAULT; 1536 } 1537 } else { 1538 memset(buf, 0, size); 1539 } 1540 } 1541 1542 if (!connected(ps)) { 1543 kfree(buf); 1544 return -ENODEV; 1545 } 1546 1547 if (ps->dev->state != USB_STATE_CONFIGURED) 1548 retval = -EHOSTUNREACH; 1549 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1550 retval = -EINVAL; 1551 else switch (ctl->ioctl_code) { 1552 1553 /* disconnect kernel driver from interface */ 1554 case USBDEVFS_DISCONNECT: 1555 if (intf->dev.driver) { 1556 driver = to_usb_driver(intf->dev.driver); 1557 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1558 usb_driver_release_interface(driver, intf); 1559 } else 1560 retval = -ENODATA; 1561 break; 1562 1563 /* let kernel drivers try to (re)bind to the interface */ 1564 case USBDEVFS_CONNECT: 1565 if (!intf->dev.driver) 1566 retval = device_attach(&intf->dev); 1567 else 1568 retval = -EBUSY; 1569 break; 1570 1571 /* talk directly to the interface's driver */ 1572 default: 1573 if (intf->dev.driver) 1574 driver = to_usb_driver(intf->dev.driver); 1575 if (driver == NULL || driver->ioctl == NULL) { 1576 retval = -ENOTTY; 1577 } else { 1578 retval = driver->ioctl(intf, ctl->ioctl_code, buf); 1579 if (retval == -ENOIOCTLCMD) 1580 retval = -ENOTTY; 1581 } 1582 } 1583 1584 /* cleanup and return */ 1585 if (retval >= 0 1586 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1587 && size > 0 1588 && copy_to_user(ctl->data, buf, size) != 0) 1589 retval = -EFAULT; 1590 1591 kfree(buf); 1592 return retval; 1593 } 1594 1595 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1596 { 1597 struct usbdevfs_ioctl ctrl; 1598 1599 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1600 return -EFAULT; 1601 return proc_ioctl(ps, &ctrl); 1602 } 1603 1604 #ifdef CONFIG_COMPAT 1605 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1606 { 1607 struct usbdevfs_ioctl32 __user *uioc; 1608 struct usbdevfs_ioctl ctrl; 1609 u32 udata; 1610 1611 uioc = compat_ptr((long)arg); 1612 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || 1613 __get_user(ctrl.ifno, &uioc->ifno) || 1614 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1615 __get_user(udata, &uioc->data)) 1616 return -EFAULT; 1617 ctrl.data = compat_ptr(udata); 1618 1619 return proc_ioctl(ps, &ctrl); 1620 } 1621 #endif 1622 1623 static int proc_claim_port(struct dev_state *ps, void __user *arg) 1624 { 1625 unsigned portnum; 1626 int rc; 1627 1628 if (get_user(portnum, (unsigned __user *) arg)) 1629 return -EFAULT; 1630 rc = usb_hub_claim_port(ps->dev, portnum, ps); 1631 if (rc == 0) 1632 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n", 1633 portnum, task_pid_nr(current), current->comm); 1634 return rc; 1635 } 1636 1637 static int proc_release_port(struct dev_state *ps, void __user *arg) 1638 { 1639 unsigned portnum; 1640 1641 if (get_user(portnum, (unsigned __user *) arg)) 1642 return -EFAULT; 1643 return usb_hub_release_port(ps->dev, portnum, ps); 1644 } 1645 1646 /* 1647 * NOTE: All requests here that have interface numbers as parameters 1648 * are assuming that somehow the configuration has been prevented from 1649 * changing. But there's no mechanism to ensure that... 1650 */ 1651 static int usbdev_ioctl(struct inode *inode, struct file *file, 1652 unsigned int cmd, unsigned long arg) 1653 { 1654 struct dev_state *ps = file->private_data; 1655 struct usb_device *dev = ps->dev; 1656 void __user *p = (void __user *)arg; 1657 int ret = -ENOTTY; 1658 1659 if (!(file->f_mode & FMODE_WRITE)) 1660 return -EPERM; 1661 usb_lock_device(dev); 1662 if (!connected(ps)) { 1663 usb_unlock_device(dev); 1664 return -ENODEV; 1665 } 1666 1667 switch (cmd) { 1668 case USBDEVFS_CONTROL: 1669 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1670 ret = proc_control(ps, p); 1671 if (ret >= 0) 1672 inode->i_mtime = CURRENT_TIME; 1673 break; 1674 1675 case USBDEVFS_BULK: 1676 snoop(&dev->dev, "%s: BULK\n", __func__); 1677 ret = proc_bulk(ps, p); 1678 if (ret >= 0) 1679 inode->i_mtime = CURRENT_TIME; 1680 break; 1681 1682 case USBDEVFS_RESETEP: 1683 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1684 ret = proc_resetep(ps, p); 1685 if (ret >= 0) 1686 inode->i_mtime = CURRENT_TIME; 1687 break; 1688 1689 case USBDEVFS_RESET: 1690 snoop(&dev->dev, "%s: RESET\n", __func__); 1691 ret = proc_resetdevice(ps); 1692 break; 1693 1694 case USBDEVFS_CLEAR_HALT: 1695 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1696 ret = proc_clearhalt(ps, p); 1697 if (ret >= 0) 1698 inode->i_mtime = CURRENT_TIME; 1699 break; 1700 1701 case USBDEVFS_GETDRIVER: 1702 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1703 ret = proc_getdriver(ps, p); 1704 break; 1705 1706 case USBDEVFS_CONNECTINFO: 1707 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1708 ret = proc_connectinfo(ps, p); 1709 break; 1710 1711 case USBDEVFS_SETINTERFACE: 1712 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1713 ret = proc_setintf(ps, p); 1714 break; 1715 1716 case USBDEVFS_SETCONFIGURATION: 1717 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1718 ret = proc_setconfig(ps, p); 1719 break; 1720 1721 case USBDEVFS_SUBMITURB: 1722 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1723 ret = proc_submiturb(ps, p); 1724 if (ret >= 0) 1725 inode->i_mtime = CURRENT_TIME; 1726 break; 1727 1728 #ifdef CONFIG_COMPAT 1729 1730 case USBDEVFS_SUBMITURB32: 1731 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1732 ret = proc_submiturb_compat(ps, p); 1733 if (ret >= 0) 1734 inode->i_mtime = CURRENT_TIME; 1735 break; 1736 1737 case USBDEVFS_REAPURB32: 1738 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1739 ret = proc_reapurb_compat(ps, p); 1740 break; 1741 1742 case USBDEVFS_REAPURBNDELAY32: 1743 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__); 1744 ret = proc_reapurbnonblock_compat(ps, p); 1745 break; 1746 1747 case USBDEVFS_IOCTL32: 1748 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1749 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1750 break; 1751 #endif 1752 1753 case USBDEVFS_DISCARDURB: 1754 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1755 ret = proc_unlinkurb(ps, p); 1756 break; 1757 1758 case USBDEVFS_REAPURB: 1759 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1760 ret = proc_reapurb(ps, p); 1761 break; 1762 1763 case USBDEVFS_REAPURBNDELAY: 1764 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__); 1765 ret = proc_reapurbnonblock(ps, p); 1766 break; 1767 1768 case USBDEVFS_DISCSIGNAL: 1769 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1770 ret = proc_disconnectsignal(ps, p); 1771 break; 1772 1773 case USBDEVFS_CLAIMINTERFACE: 1774 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1775 ret = proc_claiminterface(ps, p); 1776 break; 1777 1778 case USBDEVFS_RELEASEINTERFACE: 1779 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1780 ret = proc_releaseinterface(ps, p); 1781 break; 1782 1783 case USBDEVFS_IOCTL: 1784 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1785 ret = proc_ioctl_default(ps, p); 1786 break; 1787 1788 case USBDEVFS_CLAIM_PORT: 1789 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__); 1790 ret = proc_claim_port(ps, p); 1791 break; 1792 1793 case USBDEVFS_RELEASE_PORT: 1794 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__); 1795 ret = proc_release_port(ps, p); 1796 break; 1797 } 1798 usb_unlock_device(dev); 1799 if (ret >= 0) 1800 inode->i_atime = CURRENT_TIME; 1801 return ret; 1802 } 1803 1804 /* No kernel lock - fine */ 1805 static unsigned int usbdev_poll(struct file *file, 1806 struct poll_table_struct *wait) 1807 { 1808 struct dev_state *ps = file->private_data; 1809 unsigned int mask = 0; 1810 1811 poll_wait(file, &ps->wait, wait); 1812 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1813 mask |= POLLOUT | POLLWRNORM; 1814 if (!connected(ps)) 1815 mask |= POLLERR | POLLHUP; 1816 return mask; 1817 } 1818 1819 const struct file_operations usbdev_file_operations = { 1820 .owner = THIS_MODULE, 1821 .llseek = usbdev_lseek, 1822 .read = usbdev_read, 1823 .poll = usbdev_poll, 1824 .ioctl = usbdev_ioctl, 1825 .open = usbdev_open, 1826 .release = usbdev_release, 1827 }; 1828 1829 static void usbdev_remove(struct usb_device *udev) 1830 { 1831 struct dev_state *ps; 1832 struct siginfo sinfo; 1833 1834 while (!list_empty(&udev->filelist)) { 1835 ps = list_entry(udev->filelist.next, struct dev_state, list); 1836 destroy_all_async(ps); 1837 wake_up_all(&ps->wait); 1838 list_del_init(&ps->list); 1839 if (ps->discsignr) { 1840 sinfo.si_signo = ps->discsignr; 1841 sinfo.si_errno = EPIPE; 1842 sinfo.si_code = SI_ASYNCIO; 1843 sinfo.si_addr = ps->disccontext; 1844 kill_pid_info_as_uid(ps->discsignr, &sinfo, 1845 ps->disc_pid, ps->disc_uid, 1846 ps->disc_euid, ps->secid); 1847 } 1848 } 1849 } 1850 1851 #ifdef CONFIG_USB_DEVICE_CLASS 1852 static struct class *usb_classdev_class; 1853 1854 static int usb_classdev_add(struct usb_device *dev) 1855 { 1856 struct device *cldev; 1857 1858 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt, 1859 NULL, "usbdev%d.%d", dev->bus->busnum, 1860 dev->devnum); 1861 if (IS_ERR(cldev)) 1862 return PTR_ERR(cldev); 1863 dev->usb_classdev = cldev; 1864 return 0; 1865 } 1866 1867 static void usb_classdev_remove(struct usb_device *dev) 1868 { 1869 if (dev->usb_classdev) 1870 device_unregister(dev->usb_classdev); 1871 } 1872 1873 #else 1874 #define usb_classdev_add(dev) 0 1875 #define usb_classdev_remove(dev) do {} while (0) 1876 1877 #endif 1878 1879 static int usbdev_notify(struct notifier_block *self, 1880 unsigned long action, void *dev) 1881 { 1882 switch (action) { 1883 case USB_DEVICE_ADD: 1884 if (usb_classdev_add(dev)) 1885 return NOTIFY_BAD; 1886 break; 1887 case USB_DEVICE_REMOVE: 1888 usb_classdev_remove(dev); 1889 usbdev_remove(dev); 1890 break; 1891 } 1892 return NOTIFY_OK; 1893 } 1894 1895 static struct notifier_block usbdev_nb = { 1896 .notifier_call = usbdev_notify, 1897 }; 1898 1899 static struct cdev usb_device_cdev; 1900 1901 int __init usb_devio_init(void) 1902 { 1903 int retval; 1904 1905 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1906 "usb_device"); 1907 if (retval) { 1908 printk(KERN_ERR "Unable to register minors for usb_device\n"); 1909 goto out; 1910 } 1911 cdev_init(&usb_device_cdev, &usbdev_file_operations); 1912 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1913 if (retval) { 1914 printk(KERN_ERR "Unable to get usb_device major %d\n", 1915 USB_DEVICE_MAJOR); 1916 goto error_cdev; 1917 } 1918 #ifdef CONFIG_USB_DEVICE_CLASS 1919 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 1920 if (IS_ERR(usb_classdev_class)) { 1921 printk(KERN_ERR "Unable to register usb_device class\n"); 1922 retval = PTR_ERR(usb_classdev_class); 1923 cdev_del(&usb_device_cdev); 1924 usb_classdev_class = NULL; 1925 goto out; 1926 } 1927 /* devices of this class shadow the major:minor of their parent 1928 * device, so clear ->dev_kobj to prevent adding duplicate entries 1929 * to /sys/dev 1930 */ 1931 usb_classdev_class->dev_kobj = NULL; 1932 #endif 1933 usb_register_notify(&usbdev_nb); 1934 out: 1935 return retval; 1936 1937 error_cdev: 1938 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1939 goto out; 1940 } 1941 1942 void usb_devio_cleanup(void) 1943 { 1944 usb_unregister_notify(&usbdev_nb); 1945 #ifdef CONFIG_USB_DEVICE_CLASS 1946 class_destroy(usb_classdev_class); 1947 #endif 1948 cdev_del(&usb_device_cdev); 1949 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1950 } 1951